The default value of FACETDEV will usually cause pipe sections to be displayed in section views with line segments, rather than as smooth curves. The following illustration shows an elliptical culvert in section view when FACETDEV is set to 0.5 feet.
The number you specify for facet deviation defines the maximum distance from the chord to the arc—the chord being an edge that is created from faceting the curve to the true mathematical arc. The facet deviation has a range of greater than zero (0) and no upper limit. The lower this variable is set, the more segments will be used to draw the pipe. The minimum number of segments is 8.
The maximum number of facets is controlled by the FACETMAX variable. This variable can be set from 100 to 10,000. Note that using a small value for FACETDEV and a large value for FACETMAX will adversely affect drawing performance.
FACETDEV and FACETMAX are AutoCAD Civil 3D variables (rather than AutoCAD variables). They are therefore not listed when using the AutoCAD command SETVAR.
Use the Clean Up Pipe To Pipe Connections option in the Pipe Style dialog box, as shown in figure 4, to improve the appearance of pipe profiles so that the pipes graphically appear to line up as expected. This option is not enabled by the default, so you must select it.
Figure 4: Dialog box for selecting pipe connection clean up
Creating an alignment from network parts is a good method for generating pipe run profiles. If your local agency standards require profiles for pipe network centerlines, use the Create Alignment From Network command to convert alignments to networks.
When grip editing pipes and structures in profile view, a good practice is the use of the transparent command station/elevation. This is useful if you need to set a grip (Pipe ends/Structure rim or sump) at a certain elevation. You can also match the crown invert of adjacent pipes across structures. In general, grip editing enables you to more easily modify slopes and elevations.